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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3b2ce94bbac4b74cee73016eb21681c33a052328a39f5f927aaaa56c5498eb' 
  AND token = 'stoRK/0G0tYrJrPscV7hWwczkG1c/B5peqUb+Nx171s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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