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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b828fd02aec0b25d42759aae382374a02e2d8079362820584cfb43775b29b1' 
  AND token = '0vfJ4pBipypv+DXWrCA2DrAuLP/foRm4vQi6Jn8qWZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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