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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e632b87c958f825680b024d5084d27564ed90c745e88eb720a22f4218fd064b0' 
  AND token = 'Xo9EewEPY2h2m8l5zpexaSc2Q4NXZ2xtKkYb78sew60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00152

JSON explain

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