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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '769187c0d4d42a3eff04887c8ab0127135713453ac12cedc2b0ba999bb2e5e59' 
  AND token = 'IgmUKGLp34V5aDzBXelKE2plw88gKAKpL7t01UUFVug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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