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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5fe9d3874a5d3695a3d9b65c8db6c144801a68177f3aeffb7cbe0a764064fe' 
  AND token = 'f8edlHInq4SV0Eutekc/0SlbSEsPUVRcURHSid2uOro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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