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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee400e880a045e6950b4ad8bd297d65912574a6443247941d594a856691d9ce' 
  AND token = 'dA4cmpokoQVECFq0PF0rdBfH9UOAVb/B0SlNciSH1As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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