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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ac9b1f3033c2944619966aabec65a2e2a42cca08dfd38e8c36f59634bf7c1f' 
  AND token = 'dcko9FGlC18ihAJmlOUnoJuNtOh0EQOYJoEO4Eq6XP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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