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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1a9a2ac4c9c9597d8d21519cd319b7778f1f86c10f0a624f58cfcdd6b5cfbe' 
  AND token = '56Ia15kT8NuV3/zztYM4JLWKePxr3Porv7G5LDHwnjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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