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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa6ebf77100c087d1b5e91e37af39743ed5e68189ee70d514e19bf7b8521af2' 
  AND token = 'G73kdo5os53BWWH5Ldd2DhJF2MEnsjo44akiGG0aij4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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