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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b4e2bea9a2fe4990a7294aea5e44c24d134214caa4c242e882dec3976bc0ab' 
  AND token = 'XLruhK5TVOhu80jgx3iFNHzRm3yPALzsPREoe2mZdv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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