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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83fba9b99806ba686655e89b2299c895b2e5d1fad2c826a69c73e22d8845c77' 
  AND token = 'mYKMXDRi3Q2rwKiPz5/15mAHSe3w6l+RCggVhyuSCyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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