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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0feee03363172f744b00a774d5c4418e05f92394cd43061a7abf62b9d09e6cb' 
  AND token = 'HksDZ295911Ul+oY87VUgp7RL7Q/i5in76bVShE5Vt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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