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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64fa7a253f0f3ba6a50262d612466588a551776c3e39a2b41e1e7eca3d10240a' 
  AND token = 'JouJFlHwdla44oo873+nT2q5lWY616saNR5f8qf3+o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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