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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca2e45740aec822875eeddf50985f9853faca1820f3b1b98f9fd163fe2b02741' 
  AND token = 'UQhp33T6Eyz7qsRsRWDVKEQ5OO7jMA8cIECNB0O0Kx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}