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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e77bb7fff434bca502b87bc0b00c9ca905506d48ed1c6b3d684379b5c5386113' 
  AND token = '8Xz6om14Ufwq89e8E0HLBqbmWXVy7627JgH3rU+GXr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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