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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2afcd08a863220b2703dddea499e7c6feb404c9b3e1e38ebcc1c1ae2e70bec59' 
  AND token = 'rn7LY3+Vv7umtk49SzkYsARWCmZrK+rPakPfL+bvkIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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